Great Tit Fat Reserves under Unpredictable Temperatures
We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weig...
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Veröffentlicht in: | Journal of avian biology 1994-06, Vol.25 (2), p.156-160 |
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creator | Bednekoff, Peter A. Biebach, Herbert Krebs, John |
description | We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weights were higher during the period of unpredictable temperatures. At the end of the period with unpredictable temperatures, more weight was gained on cold than on warm days. During the unpredictable temperature treatment, birds defecated less while eating the same amount. Nightly weight loss depended upon evening weight level, but not upon overnight temperature. Our results suggest that Great Tits use daily temperatures to predict conditions for the following night and that they regulate overnight expenditures to match reserve levels. |
doi_str_mv | 10.2307/3677035 |
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During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weights were higher during the period of unpredictable temperatures. At the end of the period with unpredictable temperatures, more weight was gained on cold than on warm days. During the unpredictable temperature treatment, birds defecated less while eating the same amount. Nightly weight loss depended upon evening weight level, but not upon overnight temperature. Our results suggest that Great Tits use daily temperatures to predict conditions for the following night and that they regulate overnight expenditures to match reserve levels.</description><identifier>ISSN: 0908-8857</identifier><identifier>EISSN: 1600-048X</identifier><identifier>DOI: 10.2307/3677035</identifier><language>eng</language><publisher>Oxford: Munksgaard International</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; Animals ; Autoecology ; Aves ; Biological and medical sciences ; Birds ; Birds of prey ; Ecology ; Food ; Food consumption ; Fundamental and applied biological sciences. Psychology ; Mathematical constants ; Oxygen ; Vertebrata ; Weight gain ; Weight loss ; Wild birds</subject><ispartof>Journal of avian biology, 1994-06, Vol.25 (2), p.156-160</ispartof><rights>Copyright 1994 Munksgaard International Publishers Ltd.</rights><rights>1994 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c281t-fe244f26aa6c2d7a7f5bb7302e9f0538fdecbe01972536bb0e372e56730b98733</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/3677035$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/3677035$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,776,780,799,27901,27902,57992,58225</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=4095330$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Bednekoff, Peter A.</creatorcontrib><creatorcontrib>Biebach, Herbert</creatorcontrib><creatorcontrib>Krebs, John</creatorcontrib><title>Great Tit Fat Reserves under Unpredictable Temperatures</title><title>Journal of avian biology</title><description>We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weights were higher during the period of unpredictable temperatures. At the end of the period with unpredictable temperatures, more weight was gained on cold than on warm days. During the unpredictable temperature treatment, birds defecated less while eating the same amount. Nightly weight loss depended upon evening weight level, but not upon overnight temperature. Our results suggest that Great Tits use daily temperatures to predict conditions for the following night and that they regulate overnight expenditures to match reserve levels.</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Animals</subject><subject>Autoecology</subject><subject>Aves</subject><subject>Biological and medical sciences</subject><subject>Birds</subject><subject>Birds of prey</subject><subject>Ecology</subject><subject>Food</subject><subject>Food consumption</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Mathematical constants</subject><subject>Oxygen</subject><subject>Vertebrata</subject><subject>Weight gain</subject><subject>Weight loss</subject><subject>Wild birds</subject><issn>0908-8857</issn><issn>1600-048X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNp1z0FLwzAYxvEgCtYpfoUeBE_Vt0nTJEcZbgoDQTrwVpL0DXR0W3mTCX57Kxt68vRcfjzwZ-y2hAcuQD2KWikQ8oxlZQ1QQKU_zlkGBnShtVSX7CrGDQAIbmTG1JLQprzpU76Y9h0j0ifG_LDrkPL1biTsep-sGzBvcDsi2XQgjNfsItgh4s1pZ2y9eG7mL8Xqbfk6f1oVnusyFQF5VQVeW1t73imrgnROCeBoAkihQ4feIZRGcSlq5wCF4ijriTijlRAzdn_89bSPkTC0I_VbS19tCe1Pb3vqneTdUY42ejsEsjvfx19egZFCwB_bxLSnf9--AXe0Xow</recordid><startdate>19940601</startdate><enddate>19940601</enddate><creator>Bednekoff, Peter A.</creator><creator>Biebach, Herbert</creator><creator>Krebs, John</creator><general>Munksgaard International</general><general>Blackwell</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19940601</creationdate><title>Great Tit Fat Reserves under Unpredictable Temperatures</title><author>Bednekoff, Peter A. ; Biebach, Herbert ; Krebs, John</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c281t-fe244f26aa6c2d7a7f5bb7302e9f0538fdecbe01972536bb0e372e56730b98733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Animals</topic><topic>Autoecology</topic><topic>Aves</topic><topic>Biological and medical sciences</topic><topic>Birds</topic><topic>Birds of prey</topic><topic>Ecology</topic><topic>Food</topic><topic>Food consumption</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Mathematical constants</topic><topic>Oxygen</topic><topic>Vertebrata</topic><topic>Weight gain</topic><topic>Weight loss</topic><topic>Wild birds</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bednekoff, Peter A.</creatorcontrib><creatorcontrib>Biebach, Herbert</creatorcontrib><creatorcontrib>Krebs, John</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Journal of avian biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bednekoff, Peter A.</au><au>Biebach, Herbert</au><au>Krebs, John</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Great Tit Fat Reserves under Unpredictable Temperatures</atitle><jtitle>Journal of avian biology</jtitle><date>1994-06-01</date><risdate>1994</risdate><volume>25</volume><issue>2</issue><spage>156</spage><epage>160</epage><pages>156-160</pages><issn>0908-8857</issn><eissn>1600-048X</eissn><abstract>We tested the effects of unpredictable temperatures on fat reserves in Great Tits Parus major. During one treatment, the temperature was constant at 8.5°C. In the other, temperatures fluctuated between 1.5 and 15.5° on a 24-h basis, with changes occurring just after lights-out. Residual evening weights were higher during the period of unpredictable temperatures. At the end of the period with unpredictable temperatures, more weight was gained on cold than on warm days. During the unpredictable temperature treatment, birds defecated less while eating the same amount. Nightly weight loss depended upon evening weight level, but not upon overnight temperature. Our results suggest that Great Tits use daily temperatures to predict conditions for the following night and that they regulate overnight expenditures to match reserve levels.</abstract><cop>Oxford</cop><pub>Munksgaard International</pub><doi>10.2307/3677035</doi><tpages>5</tpages></addata></record> |
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source | Jstor Complete Legacy |
subjects | Animal and plant ecology Animal, plant and microbial ecology Animals Autoecology Aves Biological and medical sciences Birds Birds of prey Ecology Food Food consumption Fundamental and applied biological sciences. Psychology Mathematical constants Oxygen Vertebrata Weight gain Weight loss Wild birds |
title | Great Tit Fat Reserves under Unpredictable Temperatures |
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